Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

WA dad guilty of setting girl, 3, on fire

A drug-affected Perth father who claimed "the werewolf was coming" before he set his three-year-old daughter on fire and doused her autistic sister with petrol has been found guilty of trying to kill them.

Edward John Herbert had admitted intending to kill the girls at the family's Doubleview home in August 2015, but pleaded not guilty to five charges, claiming unsoundness of mind.

It was a defence that Justice Lindy Jenkins rejected as she handed down her verdict in the WA Supreme Court on Monday.

Justice Jenkins, who heard the trial without a jury, said she was not satisfied Herbert's mental impairment deprived him of the capacity to know he was doing wrong.

She noted Herbert had been drinking almost a carton of beer and smoking $50 worth of cannabis a day in the weeks leading up to his crimes, which also included threatening to kill his partner.

That night, he shouted that aliens were coming to get him and later said: "The werewolf is coming at 12 o'clock."

He ran around naked and eventually grabbed a knife, telling his partner he was going to kill her as she ran out of the house in fear.